From: tjroberts137@sbcglobal.net   
      
   On 2/26/19 1:30 PM, ben6993@hotmail.com wrote:   
   > "However, I do not believe that electrons can be aligned exactly in   
   > a given direction. [...]   
      
   In the decay of a pi- to anti_nu_e and e-, the helicity of the electron   
   must be exactly +1, so its spin is exactly parallel to its 3-momentum.   
   No other value will satisfy the conservation of angular momentum.   
      
   Similarly for the much more frequent decay of pi- to anti_nu_mu and mu-.   
      
   Note that helicity is a scalar, so this applies in any inertial frame   
   (not just the pi- rest frame).   
      
   Tom Roberts   
      
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